在我国柑桔栽培分布的北缘地带,越冬期间的冻害是个很突出的问题。这些地区在利用水体、地形小气候防冻避寒方面,已有不少研究。在丘陵和地形较单调的地区,则多以营造防护林来防冻。如上海长兴岛新桔区,利用法国冬青防护林,防御温州蜜柑冻害,已取得较好的效果。但是采用树木作防护林,由于生长缓慢,在一、二年内难以达到防寒的要 In the northern margin of citrus cultivation and distribution in China, frost damage during the winter is a very prominent issue. There have been quite a few studies on the use of water bodies and the antifreeze and cold shelter in the microclimate of terrain in these areas. In the more monotonous regions of the hills and terrain, more shelterbelts are used to prevent freezing. Shanghai Changxing Island, such as the new Orange District, the use of French holly shelter, defense of orange juice freeze in Wenzhou, has achieved good results. However, the use of trees as shelterbelt, due to slow growth, in a year or two difficult to reach the cold to